/*
 * Copyright 2008 Carnegie Mellon University
 * Licensed under the Apache License, Version 2.0 (the "License"); 
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, 
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package edu.cmu.lti.sepia.api.processor;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.json.JSONObject;

import edu.cmu.lti.sepia.api.json.JsonAction;
import edu.cmu.lti.sepia.data.db.SQL;
import edu.cmu.lti.sepia.data.db.VoteDAO;
import edu.cmu.lti.sepia.infra.topic.model.Vote;
import edu.cmu.lti.sepia.util.ExceptionUtil;
import edu.cmu.lti.sepia.util.ServletUtil;

public class VoteProcessor extends AbstractProcessor {
	
	@Override
	public JSONObject process( SQL sql, JsonAction action, HttpServletRequest request ) {
		ServletUtil servletUtil = new ServletUtil( request );
		
		String taskNameShort = servletUtil.readString( "taskNameShort", "" );
    List<Vote> votes = getVotes(request);
				
    JSONObject json = new JSONObject();
	    try {
	      json.put("msg","succeeded");
		
    		if ( action.equals( JsonAction.UpdateVote ) ) {
    			VoteDAO.updateVotes( sql, taskNameShort, votes );
    		}
	    } catch ( Exception e ) {
	      e.printStackTrace();
	      try {
	        json.put("exception", ExceptionUtil.exceptionToString(e));
	      } catch (Exception e2) {
	        e2.printStackTrace();
	      }
	    }
	    return json;
	  }
	
	public static List<Vote> getVotes( HttpServletRequest request ) {
		if ( request.getParameter("pNuggetIds")==null 
				&& request.getParameter("nNuggetIds")==null ) return null;
		
		List<Vote> votes = new ArrayList<Vote>();
		
		ServletUtil s = new ServletUtil( request );
		String[] pNuggetIds = s.readString("pNuggetIds", "").split("_");
		String[] nNuggetIds = s.readString("nNuggetIds", "").split("_");
		
		int userId = s.readInt("userId", 0); 
		
		for ( String nuggetIdStr : pNuggetIds ) {
			if ( nuggetIdStr.length()==0 ) continue;
			int nuggetId = Integer.parseInt(nuggetIdStr);
			votes.add( new Vote( nuggetId, userId, true ) );
		}
		for ( String nuggetIdStr : nNuggetIds ) {
			if ( nuggetIdStr.length()==0 ) continue;
			int nuggetId = Integer.parseInt(nuggetIdStr);
			votes.add( new Vote( nuggetId, userId, false ) );
		}
		
		return votes;
	}
	
}
